Method, system and program product for storing downloadable content on a plurality of enterprise storage system (ESS) cells

ABSTRACT

The present invention takes advantage of unused storage space within the ESS cells to provide for the efficient and cost effective storage of downloadable content. Specifically, the system of the present invention generally includes a download grid manager that communicates with the ESS cells. Content to be replicated to the ESS cells, and characteristics corresponding thereto, are received on the download grid manager from a content owner (or the like). Based on the characteristics, a storage policy, and storage information previously received from the ESS cells, the download grid manager will replicate the downloadable content to unused storage space within the ESS cells.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patentapplication Ser. No. 10/890,853 filed Jul. 13, 2004, now U.S. Pat. No.7,277,985. This application is related in some aspects to U.S. patentapplication Ser. No. 10/862,977, entitled Method, System and ProgramProduct for Optimized Concurrent Data Download Within a Grid ComputingEnvironment, filed Jun. 8, 2004, which is herein incorporated byreference.

FIELD OF THE INVENTION

In general, the present invention provides a method, system and programproduct for storing/replicating downloadable content on a plurality ofEnterprise Storage System (ESS) cells. Specifically, the presentinvention takes advantage of unused storage space (e.g., “White Space”)within the ESS cells to provide for the efficient and cost effectivestorage of downloadable content.

BACKGROUND OF THE INVENTION

As the use of information technology (IT) becomes more prevalent, it hasbecome increasingly common for many organizations to use an EnterpriseStorage System (ESS) for storing files and the like. In an ESS, multipledata storage cells or farms are provided at different geographiclocations throughout the country or world. These cells can be used forsharing files among individuals within the organizations. For example,International Business Machines Corp. of Armonk, N.Y. uses a technologyknown as the Global Storage Architecture (GSA) for file sharing. Underthe GSA, storage cells are positioned at various locations throughoutthe world. Based on different criteria, content is stored to the cells.

Currently, IBM offers 25 GSA sites worldwide with plans to expand in thefuture. However, like many ESS's, a vast quantity of storage resourcesthroughout the GSA are underutilized and unbalanced due to theclustering design that is based on physical location. Specifically,depending on geographic location, content is sent to a designatedstorage location. Because of this constraint, typical storage systemsare designed and provisioned with a target average utilization, whichhas traditionally been unbalanced among the cells. In fact, as can beseen from graph 10 of FIG. 1, it is common for ESS cells to have vastquantities of unused space, which will continue to go underutilized.Specifically, FIG. 1 shows the used and unused storage space for anillustrative ESS cell. As can be seen in the month of August, only about0.4 TB of the available 1.6 TB were utilized. This indicates that about1.2 TB of this ESS cell is unused (e.g., White Space).

One previous development by IBM for fine tuning the storage methodologyfor an ESS was the subject of U.S. patent application Ser. No.10/718,419, filed Nov. 20, 2003, and entitled Computerized System,Method and Program Product for managing an Enterprise Storage System,herein incorporated by reference. Under this previous application,files/content are stored on certain ESS cells based on variousperformance parameters. Such parameters include, among others, storagecosts.

As advantageous as this previous development has been, no existingsystem provides a way to store content to GSA cells based on the unusedstorage space therein. That is, no previous system takes advantage ofthe unused storage space in ESS cells.

In view of the foregoing, there exists a need for a method, system andprogram product for storing/replicating downloadable content on aplurality of Enterprise Storage System (ESS) cells. Specifically, a needexists for a system that takes advantage of unused space (e.g., “WhiteSpace”) within the ESS cells to provide for the efficient and costeffective storage of downloadable content. To this extent, a need existsfor a system that monitors the unused space within GSA cells, andmanages the storage of new content to the unused space based on themonitoring and a storage policy that sets limits for the amount ofunused space allowed to be consumed by the new content.

SUMMARY OF THE INVENTION

In general, the present invention provides a method, system and programproduct for storing/replicating downloadable content on a plurality ofEnterprise Storage System (ESS) cells. Specifically, the presentinvention takes advantage of unused storage space within the ESS cellsto provide for the efficient and cost effective storage of downloadablecontent. The system of the present invention generally includes adownload grid manager that communicates with the ESS cells. Content tobe replicated to the ESS cells, and characteristics correspondingthereto, are received on the download grid manager from a content owner(or the like). Based on the characteristics, a storage policy, andstorage information previously received from the ESS cells, the downloadgrid manager will replicate the downloadable content to unused storagespace within the ESS cells. The storage policy generally indicates alimit of unused storage space within each ESS cell that downloadablecontent is permitted to occupy. As this process is performed fordifferent sets of downloadable content, the download grid manager willreceive feedback from the ESS cells. When the feedback indicates thatdownloadable content is approaching the limit indicated by the storagepolicy, the download grid manager will cease further replication to thatESS and/or delete downloadable content therefrom.

A first aspect of the present invention provides a method for storingdownloadable content on a plurality of Enterprise Storage System (ESS)cells, comprising: receiving the downloadable content andcharacteristics corresponding to the downloadable content on a downloadgrid manager; and replicating the downloadable content from the downloadgrid manager to unused storage space of the plurality of ESS cells basedon the characteristics and a storage policy, wherein the storage policyindicates a limit of the unused storage space on each of the pluralityof ESS cells that the downloadable content is permitted occupy.

A second aspect of the present invention provides a method for storingdownloadable content on a plurality of Enterprise Storage System (ESS)cells, comprising: receiving the downloadable content andcharacteristics corresponding to the downloadable content on a downloadgrid manager; replicating the downloadable content from the downloadgrid manager to unused storage space of the plurality of ESS cells basedon the characteristics and a storage policy, wherein the storage policyindicates a limit of the unused storage space on each of the pluralityof ESS cells that the downloadable content is permitted occupy;assigning the downloadable content a priority on the plurality of ESScells, wherein the priority assigned to the downloadable content islower than a priority of content stored within used storage space of theplurality of ESS cells; receiving feedback from the plurality of ESScells indicating an amount of space used by the downloadable content;and managing the downloadable content on the plurality of ESS cellsbased on the feedback, the priority and the limit indicated in thestorage policy.

A third aspect of the present invention provides a system for storingdownloadable content on a plurality of Enterprise Storage System (ESS)cells, comprising: an input reception system for receiving thedownloadable content and characteristics corresponding to thedownloadable content on a download grid manager; and a contentreplication system for replicating the downloadable content from thedownload grid manager to unused storage space of the plurality of ESScells based on the characteristics and a storage policy, wherein thestorage policy indicates a limit of the unused storage space on each ofthe plurality of ESS cells that the downloadable content is permittedoccupy.

A fourth aspect of the present invention provides a program productstored on a recordable medium for storing downloadable content on aplurality of Enterprise Storage System (ESS) cells, which when executed,comprises: program code for receiving the downloadable content andcharacteristics corresponding to the downloadable content on a downloadgrid manager; and program code for replicating the downloadable contentfrom the download grid manager to unused storage space of the pluralityof ESS cells based on the characteristics and a storage policy, whereinthe storage policy indicates a limit of the unused storage space on eachof the plurality of ESS cells that the downloadable content is permittedoccupy.

A fifth aspect of the present invention provides a system for deployingan application for storing downloadable content on a plurality ofEnterprise Storage System (ESS) cells, comprising: a computerinfrastructure being operable to: receive the downloadable content andcharacteristics corresponding to the downloadable content on a downloadgrid manager; and replicate the downloadable content from the downloadgrid manager to unused storage space of the plurality of ESS cells basedon the characteristics and a storage policy, wherein the storage policyindicates a limit of the unused storage space on each of the pluralityof ESS cells that the downloadable content is permitted occupy.

A sixth aspect of the present invention provides computer softwareembodied in a propagated signal for storing downloadable content on aplurality of Enterprise Storage System (ESS) cells, the computersoftware comprising instructions to cause a computer system to performthe following functions: receive the downloadable content andcharacteristics corresponding to the downloadable content on a downloadgrid manager; and replicate the downloadable content from the downloadgrid manager to unused storage space of the plurality of ESS cells basedon the characteristics and a storage policy, wherein the storage policyindicates a limit of the unused storage space on each of the pluralityof ESS cells that the downloadable content is permitted occupy.

Therefore, the present invention provides a method, system and programproduct for storing/replicating downloadable content to unused storagespace of a plurality of Enterprise Storage System (ESS) cells.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features of this invention will be more readilyunderstood from the following detailed description of the variousaspects of the invention taken in conjunction with the accompanyingdrawings in which:

FIG. 1 depicts a graph showing total space and unused space for anillustrative ESS cell.

FIG. 2 depicts an illustrative system for replicating downloadablecontent to unused storage space within ESS cells according to thepresent invention.

FIG. 3 depicts the download grid manager of FIG. 2 in greater detail.

The drawings are not necessarily to scale. The drawings are merelyschematic representations, not intended to portray specific parametersof the invention. The drawings are intended to depict only typicalembodiments of the invention, and therefore should not be considered aslimiting the scope of the invention. In the drawings, like numberingrepresents like elements.

BEST MODE FOR CARRYING OUT THE INVENTION

For convenience purposes, the Best Mode for Carrying Out the Inventionwill have the following sections:

I. General Description

II. Download Grid

III Computerized Implementation

1. General Description

As indicated above, the present invention provides a method, system andprogram product for storing/replicating downloadable content on aplurality of Enterprise Storage System (ESS) cells. Specifically, thepresent invention takes advantage of unused storage space within the ESScells to provide for the efficient and cost effective storage ofdownloadable content. The system of the present invention generallyincludes a download grid manager that communicates with the ESS cells.Content to be replicated to the ESS cells, and characteristicscorresponding thereto, are received on the download grid manager from acontent owner (or the like). Based on the characteristics, a storagepolicy, and storage information previously received from the ESS cells,the download grid manager will replicate the downloadable content tounused storage space within the ESS cells. The storage policy generallyindicates a limit of unused storage space within each ESS cell thatdownloadable content is permitted to occupy. As this process isperformed for different sets of downloadable content, the download gridmanager will receive feedback from the ESS cells. When the feedbackindicates that downloadable content is approaching the limit indicatedby the storage policy, the download grid manager will cease furtherreplication to that ESS and/or or delete downloadable content therefrom.

It should be understood that a typical example of an ESS could be theGlobal Storage Architecture (GSA) provided by IBM Corp. of Armonk, N.Y.However, it should be appreciated that the teachings described hereincould be used in conjunction with any type of grid computingenvironment.

II. Download Grid

As indicated above in conjunction with FIG. 1, it is often the case thatmany ESS cells have substantial unused storage space. For example,referring back to graph 10 of FIG. 1, it is noted that in the month ofAugust, only 0.4 TB of the total available storage space for this ESScell was being used. Given the total capacity of about 1.6 TB, the ESScell of this example had approximately 1.2 TB of unused storage space orWhite Space. The present invention proposes to take advantage of thisunused storage space without risking overuse, or in any way compromisingthe storage of content stored in the used storage space ESS cell.

Referring now to FIG. 2, an illustrative storage grid 20 according tothe present invention is shown. As depicted, storage grid 20 includes adownload grid manager (DGM) 22 that communicates with content owner 24,content requestor 26, ESS cells 28A-B, and ESS users 44 over network 30.In general, content owner 24 will provide content for storage in ESScells 28A-B to DGM 22, while content requestor 26 can request thecontent from DGM 22. It should be understood in advance that two ESScells 28A-B are shown for illustrative purposes only. To this extent,the teachings described herein could be carried out in conjunction withany quantity of ESS cells. It should also be understood that thecommunication/storage labels shown within ESS cells 28A-B (e.g., SAN andEthernet) are shown to illustrate a typical embodiment only, and thatthe teachings described herein could be carried out with various otheralternatives.

In any event, network 30 can be any type of network such as theInternet, a local area network (LAN), a wide area network (WAN), avirtual private network (VPN), etc. Communication between the componentsshown in FIG. 2 could occur via a direct hardwired connection (e.g.,serial port), or via an addressable connection that may utilize anycombination of wireline and/or wireless transmission methods. Moreover,conventional network connectivity, such as Token Ring, Ethernet, WiFi orother conventional communications standards could be used. Still yet,connectivity could be provided by conventional TCP/IP sockets-basedprotocol. In this instance, an Internet service provider could be usedto establish interconnectivity. Further, communication between thecomponents could occur in a client-server or server-server environment.

Before a more detailed description of the components of ESS cells 28A-Bare given, it should be understood that some of the components shownwithin ESS cells 28A-B also have an application for downloading storedcontent from ESS cells 28A-B to content requester 26 in chunks.Regardless, network dispatchers 40A-D generally provide load balancingwith ESS cells 28A-B. As will be further described below, networktraffic in the form of requests to store and download content occursthrough ESS cells 28A-B. Network dispatchers 40A-D help balance the loadcreated by such traffic, which helps prevent overload conditions fromoccurring. Lightweight Directory Access Protocol (LDAP) components 42A-Dprovide security to help ensure that only authorized parties (e.g.,content owner 24, content requester 26 and ESS users 44) can accesscontent stored in ESS cells 28A-B.

Service delivery agents 36A-F and download services (DLS) 38A-Ffacilitate communication between ESS cells 28A-B and DGM 22. Thosecomponents are also discussed in detail in the pending application thatwas cross-referenced and incorporated above. In the that application, itis discussed how service delivery agents (SDAs) 36A-F and downloadservices (DLSs) 38A-F allow content such as files requested by contentrequester 26 to be retrieved in chunks from multiple ESS cells 28A-B(e.g., instead of retrieving the entire file from a single ESS cell).For example, if content requester 26 requested a certain file, therequest would be received by DGM 22, which would communicate with DLS38A-F. Instead of obtaining the entire file from one ESS, the file wouldbe obtained in chunks from multiple different ESS's. For example, onehalf of the file could be retrieved from ESS 28A, while the other halfis retrieved from ESS 28B.

Under the present invention, the communication between SDAs 36A-F, DLSs38A-F, and DGM 22 is further used to optimize the storage ofdownloadable content in the unused storage space 33A-B of contentstorage units 32A-B of ESS cells 28A-B. Specifically, under the presentinvention, monitoring components 34A-B will monitor “storageinformation” corresponding to content storage units 32A-B. This “storageinformation” typically describes the total storage space and unusedstorage space 33A-B within storage units 32A-B. After being determinedby monitoring components 34A-B, the “storage information” will becommunicated to SDAs 36A-F, to DLSs 38A-F, and then to DGM 22.

It should be appreciated that content storage units 32A-B can be anysystems (e.g., databases, etc.) capable of providing storage of content(e.g., both downloadable and non-downloadable) under the presentinvention. As depicted, content storage units 32A-B include used storagespace 31A-B and unused storage space 33A-B, which are typically brokendown into file systems. For example, assume content storage unit 32A hasa total 300 GB of unused storage space 33A. Further assume that thetotal unused storage space 33A is broken down into three file systems.In this case, each file system could have 100 GB of unused storagespace. Included within used storage space 31A-B is “DLS coding andconfiguration.” The DLS coding and configuration controls DLSs 38A-F toallow a single piece of content to be provided to content requester 26in chunks from multiple different cells such as ESS cells 28A-B. Stillfurther, storage units 32A-B could include one or more storage devices,such as a magnetic disk drive or an optical disk drive. In anotherembodiment, storage units 32A-B include data distributed across, forexample, a local area network (LAN), wide area network (WAN) or astorage area network (SAN) (not shown).

Under the present invention, when content owner 24 wishes to store thedownloadable content in ESS cells 28A-B, he/she will communicate thedownloadable content along with corresponding characteristics to DGM 22.Such characteristics can include, among others, a size of thedownloadable content to be stored, a geographic location (e.g., ofcontent owner 24), etc. Upon receipt, DGM 22 will replicate the contentto the unused storage space 33A-B of ESS cells 28A-B based on thecharacteristics, the storage information provided by monitoringcomponents 34A-B, and a storage policy 46. In general, the storagepolicy 46 sets forth a limit of the unused storage space 33A-B that ispermitted to occupied by downloadable content from DGM 22. For example,the storage policy 46 could state that DGM 22 can use up to a certainquota (e.g., 80%) of the total unused storage space 33A-B in any ESSfile system, not to exceed a certain amount (e.g., 250 GB) in each. Inaddition, the storage policy could dictate that if the unused storagespace 33A in any file system drops below a certain minimal threshold(e.g., 100 GB), the allocation can be reduced regardless of thepercentage of unused storage space in that file system. Thus, forexample, if a particular file system (e.g., file system “X” of unusedstorage space 33A) has a total of 120 GB in unused storage space 33A,the 80% rule would permit 96 GB to be used by DGM 22. However, afterusing 21 GB, the total unused storage space 33A for that file systemwould fall to 99 GB (e.g., below the 100 GB minimal threshold. Thus,even though DGM 22 has not consumed 80% of the total unused space 33A inthat file system, DGM 22 could begin to route downloadable content toother file systems. Example logic for an illustrative storage policy 46could be as follows:

DownLoadGridmaxGB=250 DownLoadGridmaxpercent=0.8 FilesystemMinFreeGB=100if (FilesystemFreeGB > 100) then if ((FilesystemFreeGB* DownLoadGridMaxPercent) > DownLoadGridMaxGB) then DownLoadGridStorage= DownLoadGridMaxGB /* Lots of space */ else DownLoadGridStorage =(FilesystemFreeGB * DownLoadGridMaxPercent) /* A percentage of freespace */ endif if ((FilesystemFreeGB - DownLoadGridStorage) <FilesystemMinFreeGB) then DownLoadGridStorage = (FreeFilesystemGB -FilesystemMinFreeGB) /* Ensure at least 100 GB free */ endif elseDownLoadGridStorage = 0 /* Not enough Free Space */ endif

The below table illustrates actions that can be taken based on thestorage policy 46:

Cell Free Space Space Quota Space Used Action 1300 GB  500 GB  0 GBInitial Setup 700 GB 500 GB 200 GB Storage Increase 500 GB 500 GB 400 GBStorage Increase 200 GB 500 GB 400 GB Decrease Quota 400 GB 300 GB 300GB Decrease Grid 700 GB 500 GB 300 GB Increase Quota

Based on storage policy 46, the storage information and thecharacteristics, DGM 22 will replicate the downloadable content providedby content owner 24 to unused storage space 33A-B within ESS cells28A-B. For example, in choosing ESS cells 28A-B for replicating thedownloadable content, DGM 22 will analyze the characteristics providedby content owner 24. As mentioned above, such characteristics couldinclude, among other things, the size of the downloadable content,geographic location of content owner 24 (e.g., so that the content canbe replicated to the cells closest to content owner 24), etc. Inaddition, before ESS cells 28A-B can be selected as replication sitesfor the downloadable content, DGM 22 will examine the storageinformation received from ESS cells 28A-B in view of the storage policy46 to ensure that ample space is available, and no storage rulescontained within the storage policy 46 will be broken.

As indicated above, two ESS cells 28A-B are shown herein forillustrative purposes. The teachings of the present invention could becarried out in conjunction with any quantity of ESS cells 28A-B. To thisextent, although the downloadable content will be replicated to multipleESS cells, it is not necessary for the downloadable content to bereplicated to every ESS cell in a download grid. For example, if adownload grid includes 100 ESS cells, the downloadable content might notbe replicated to each and every ESS cell.

Regardless, assume in this example that both ESS 28A and ESS cell 28Bwere selected by DGM 22. In this event, the downloadable content wouldbe replicated to the unused storage space 33A-B within content storageunits 32A-B. In performing the replication operation, DGM 22 will alsoassign the downloadable content a priority that is lower than a priorityof content already stored in the used storage space 33A-B of ESS cells28A-B. This helps ensure that the usage of unused storage space 33A-Bwill be subservient to the content in used storage space 31A-B, thus,preventing any conflicts and preserving the integrity of the content inthe used storage space 31A-B.

Once replication has been complete, the content is available fordownload in chunks from the multiple locations, as opposed to retrievingthe entire piece of content from a single location. For example, ifcontent requestor 26 wished to download the content, securityverification would first be performed by LDAPs 42A-D. Assuming contentrequestor 26 was authorized to access that downloadable content, itwould be retrieved to content requestor 26 in chunks from multiplelocations (e.g., ESS cells 28A-B). Downloading content to contentrequester 26 in chunks provides several advantages. First, bandwidth issaved because the entire piece of content is not communicated throughone pipeline, rather, smaller chunks of the content are communicatedthrough multiple different communication pipelines. In addition, becausethe content is taken in smaller chunks, download time is reduced whencompared with downloading the entire file in one large chunk. A moredetailed description of the process of downloading content in chunks isprovided in the above-cross-referenced and incorporated patentapplication.

In any event, as DGM 22 replicates downloadable content to unusedstorage space 33A-B of ESS cells 28A-B in this manner, monitoringcomponents 34A-B will continue to monitor the storage within ESS cells28A-B. Specifically, monitoring components 34A-B will examine the amountof unused storage space being utilized by DGM 22, and provide feedbackbased thereon. Similar to the storage information, this feedback will berouted through SDAs 36A-F and DLSs 38A-F to DGM 22. Based on thefeedback, the storage policy 46 and the lower priority assigned to thedownloadable content, DGM 22 will manage the downloadable contentaccordingly. For example, if the feedback indicates that the limit setforth in the storage policy has been or is about to be exceeded for ESScell 28A, DGM 22 can decrease the quota for ESS cell 28A by deletingdownloadable content therefrom and/or relocating downloadable content toanother ESS cell (not shown). The feedback can also work to increase thereplication to a certain ESS cells. For example, if the feedbackindicates that a higher amount of unused storage space is available inESS cell 28A, DGM 22 can increase its quota for ESS cell 28A.

It should be appreciated that in monitoring content storage units 32A-Band providing feedback to DGM 22, monitoring components 34A-B could haveaccess to storage policy 46. This would allow monitoring components34A-B to provide DGM 22 with “smart” feedback and even a preferredcourse of action to take (e.g., storage limit of ESS cell “Y” beingapproached, delete file “X” from ESS cell “Y”).

III. Computerized Implementation

Referring now to FIG. 3, a computerized implementation of DGM 22 isshown.

As depicted, DGM 22 generally includes central processing unit (CPU) 50,memory 52, bus 54, input/output (I/O) interfaces 56 and externaldevices/resources 58. CPU 50 may comprise a single processing unit, orbe distributed across one or more processing units in one or morelocations, e.g., on a client and server. Memory 52 may comprise anyknown type of data storage and/or transmission media, including magneticmedia, optical media, random access memory (RAM), read-only memory(ROM), a data cache, a data object, etc. Moreover, similar to CPU 50,memory 52 may reside at a single physical location, comprising one ormore types of data storage, or be distributed across a plurality ofphysical systems in various forms.

I/O interfaces 56 may comprise any system for exchanging informationto/from an external source. External devices/resources 58 may compriseany known type of external device, including speakers, a CRT, LEDscreen, hand-held device, keyboard, mouse, voice recognition system,speech output system, printer, monitor/display, facsimile, pager, etc.Bus 54 provides a communication link between each of the components inDGM 22 and likewise may comprise any known type of transmission link,including electrical, optical, wireless, etc. Although not shown,additional components, such as cache memory, communication systems,system software, etc., may be incorporated into DGM 22. In addition, anycomputer systems operated by content owner 24 and content requester 26will likely include computerized components similar to DGM 22. Stillfurther, ESS users 44 (FIG. 2) have not been depicted in FIG. 3 forsimplicity purposes.

Shown in memory 52 of DGM as a program product is content system 60. Ingeneral, content system 60 includes program code for carrying out thecontent storage functions described above. Specifically, content system60 is shown as including input reception system 62, content replicationsystem 64, priority system 66 and content management system 68. Itshould be understood, that although not shown, DGM 22 will also likelyinclude program code for carrying out the retrieval of content in chunksfrom ESS cells 28A-B.

In any event, as described above, when content owner 24 wishes to storedownloadable content on ESS cells 28A-B, he/she will submit the contentalong with corresponding characteristics to DGM 22. The downloadablecontent and characteristics will be received by input reception system62. Upon receipt, content replication system 64 will identify the ESScells that are best suited for replication of the downloadable content.This determination is generally made based on the characteristics,storage policy 46 and storage information as received from ESS cells28A-B (e.g., as monitored by the monitoring components therein).Assuming that ESS cells 28A-B were selected for the replication, contentreplication system 64 would then replicate the content to the unusedstorage space therein. In addition, priority system 66 would assign thedownloadable content a priority that is lower than a priority of contentalready stored in the used storage space of ESS cells 28A-B.

As these operations continue over time, content management system 68will continually manage the downloadable content within unused storagespace of ESS cells 28A-B to ensure that storage of the higher prioritycontent is never compromised. Specifically, content management system 68will receive feedback as provided by the monitoring components of ESScells 28A-B. Based on the feedback, the storage policy and the priority,content management system 68 will manage the downloadable contentaccordingly. As indicated above, this could involve deletingdownloadable content from an ESS cell, moving downloadable content toanother ESS cell (not shown), or even increasing storage to unusedstorage space of an ESS cell.

It should be understood that the present invention can be realized inhardware, software, a propagated signal, or any combination thereof. Anykind of computer/server system(s)—or other apparatus adapted forcarrying out the methods described herein—is suited. A typicalcombination of hardware and software could be a general purpose computersystem with a computer program that, when loaded and executed, carriesout the respective methods described herein. Alternatively, a specificuse computer, containing specialized hardware for carrying out one ormore of the functional tasks of the invention, could be utilized. Thepresent invention can also be embedded in a computer program product ora propagated signal, which comprises all the respective featuresenabling the implementation of the methods described herein, andwhich—when loaded in a computer system—is able to carry out thesemethods. Computer program, propagate signal, software program, program,or software, in the present context mean any expression, in anylanguage, code or notation, of a set of instructions intended to cause asystem having an information processing capability to perform aparticular function either directly or after either or both of thefollowing: (a) conversion to another language, code or notation; and/or(b) reproduction in a different material form.

The foregoing description of the preferred embodiments of this inventionhas been presented for purposes of illustration and description. It isnot intended to be exhaustive or to limit the invention to the preciseform disclosed, and obviously, many modifications and variations arepossible. Such modifications and variations that may be apparent to aperson skilled in the art are intended to be included within the scopeof this invention as defined by the accompanying claims. For example,the configuration of content system 60 of FIG. 3 is intended to beillustrative only. As such, content system 60 could be represented by adifferent configuration of systems. Moreover, content system 60 could beimplemented in conjunction with a system/program code for retrievingcontent in chunks from ESS cells 28A-B.

1. A method for storing downloadable content on a plurality ofEnterprise Storage System (ESS) cells to which content is assigned basedon proximity to a geographic location of the sender, the plurality ofESS cells being cells that are dedicated to the ESS in a grid havingservice delivery agents and download services that allow requestedcontent to be retrieved in chunks from multiple ESS cells, comprising:receiving the downloadable content and characteristics corresponding tothe downloadable content on a download grid manager; and replicating thedownloadable content from the download grid manager to unused storagespace of the plurality of ESS cells based on the characteristics and astorage policy that indicates a limit of the unused storage space oneach of the plurality of ESS cells that the downloadable content ispermitted occupy, by: determining whether an ESS cell to which thecontent is assigned based on the proximity of the ESS cell being greaterthan a proximity of a different ESS cell to the geographic location ofthe sender fails to comply with the storage policy; based on adetermination that the ESS cell fails to comply, replicating thedownloadable content to at least one other ESS cell in the plurality ofESS cells that is less proximate to the geographic location of thesender than the ESS cell; and otherwise, replicating the content to theESS cell to which the content is assigned based on the proximity of theESS cell to the geographic location of the sender, wherein the downloadgrid manager manages the downloadable content by at least one of:deleting the downloadable content from one of the plurality of ESS cellsor moving the downloadable content to another ESS cell, based on thepriority, the limit, and the feedback.
 2. The method of claim 1, furthercomprising: monitoring the storage within the plurality of ESS cells;and providing feedback to the download grid manager based on themonitoring.
 3. The method of claim 2, wherein the monitoring isperformed by a monitoring component within each of the ESS cells, andwherein the feedback is communicated from the monitoring component to aset of download services within each of the plurality of ESS cells andthen from the set of download services to the download grid manager. 4.The method of claim 2, further comprising deleting the downloadablecontent from one of the plurality of ESS cells when the feedbackindicates that the limit of the storage policy is exceeded for the oneESS cell.
 5. The method of claim 1, wherein the characteristics of thedownloadable content comprise at least one characteristic selected fromthe group consisting of a size of the downloadable content, and ageographic scope of the downloadable content.
 6. The method of claim 1,wherein the limit is expressed within the storage policy as a totalamount of unused storage space and a quota of the unused storage spacepermitted to be used by the downloadable content.
 7. The method of claim1, further comprising receiving storage information on the download gridmanager from the plurality of ESS cells prior to the receiving step,wherein the downloadable content is replicated to the unused storagespace based further on the storage information.
 8. A system for storingdownloadable content on a plurality of Enterprise Storage System (ESS)cells to which content is assigned based on proximity to a geographiclocation of the sender, the plurality of ESS cells being cells that arededicated to the ESS in a grid having service delivery agents anddownload services that allow requested content to be retrieved in chunksfrom multiple ESS cells, comprising: an input reception system forreceiving the downloadable content and characteristics corresponding tothe downloadable content on a download grid manager; and a contentreplication system for replicating the downloadable content from thedownload grid manager to unused storage space of the plurality of ESScells based on the characteristics and a storage policy that indicates alimit of the unused storage space on each of the plurality of ESS cellsthat the downloadable content is permitted occupy, by: determiningwhether an ESS cell to which the content is assigned based on theproximity of the ESS cell being greater than a proximity of a differentESS cell to the geographic location of the sender fails to comply withthe storage policy; based on a determination that the ESS cell fails tocomply, replicating the downloadable content to at least one other ESScell in the plurality of ESS cells that is less proximate to thegeographic location of the sender than the ESS cell; and otherwise,replicating the content to the ESS cell to which the content is assignedbased on the proximity of the ESS cell to the geographic location of thesender, wherein the download grid manager manages the downloadablecontent by at least one of: deleting the downloadable content from oneof the plurality of ESS cells or moving the downloadable content toanother ESS cell, based on the priority, the limit, and the feedback. 9.The system of claim 8, further comprising a monitoring component formonitoring storage within the plurality of ESS cells, wherein feedbackis provided to the download grid manager based on the monitoring. 10.The system of claim 9, wherein, for each of the plurality of ESS cells,the feedback is communicated from the monitoring component to a set ofdownload services within each of the plurality of ESS cells, and thenfrom the set of download services to the download grid manager.
 11. Thesystem of claim 9, further comprising a content management system thatdeletes the downloadable content from one of the plurality of ESS cellswhen the feedback indicates that the limit of the storage policy isexceeded for the one ESS cell.
 12. The system of claim 8, wherein thecharacteristics of the downloadable content comprise at least onecharacteristic selected from the group consisting of a size of thedownloadable content, and a geographic scope of the downloadablecontent.
 13. The system of claim 8, wherein the limit is expressedwithin the storage policy as a total amount of unused storage space anda quota of the unused storage space permitted to be used by thedownloadable content.
 14. The system of claim 8, wherein the inputreception system further receives storage information from the pluralityof ESS cells, and wherein the downloadable content is replicated to theunused space based on the storage information.
 15. A program productstored on a computer recordable storage medium for storing downloadablecontent on a plurality of Enterprise Storage System (ESS) cells to whichcontent is assigned based on proximity to a geographic location of thesender, the plurality of ESS cells being cells that are dedicated to theESS in a grid having service delivery agents and download services thatallow requested content to be retrieved in chunks from multiple ESScells, which when executed, comprises: program code for receiving thedownloadable content and characteristics corresponding to thedownloadable content on a download grid manager; and program code forreplicating the downloadable content from the download grid manager tounused storage space of the plurality of ESS cells based on thecharacteristics and a storage policy that indicates a limit of theunused storage space on each of the plurality of ESS cells that thedownloadable content is permitted occupy, by: determining whether an ESScell to which the content is assigned based on the proximity of the ESScell being greater than a proximity of a different ESS cell to thegeographic location of the sender fails to comply with the storagepolicy; based on a determination that the ESS cell fails to comply,replicating the downloadable content to at least one other ESS cell inthe plurality of ESS cells that is less proximate to the geographiclocation of the sender than the ESS cell; and otherwise, replicating thecontent to the ESS cell to which the content is assigned based on theproximity of the ESS cell to the geographic location of the sender,wherein the download grid manager manages the downloadable content by atleast one of: deleting the downloadable content from one of theplurality of ESS cells or moving the downloadable content to another ESScell, based on the priority, the limit, and the feedback.
 16. Theprogram product of claim 15, further comprising program code formonitoring the storage within the plurality of ESS cells, whereinfeedback is provided to the download grid manager based on themonitoring.
 17. The program product of claim 16, wherein, for each ofthe plurality of ESS cells, the feedback is communicated from theprogram code for monitoring to a set of download services within each ofthe plurality of ESS cells, and then from the set of download servicesto the download grid manager.
 18. The program product of claim 16,further comprising program code for managing, wherein the program codefor managing deletes the downloadable content from one of the pluralityof ESS cells when the feedback indicates that the limit of the storagepolicy is exceeded for the one ESS cell.
 19. The program product ofclaim 15, wherein the characteristics of the downloadable contentcomprise at least one characteristic selected from the group consistingof a size of the downloadable content, and a geographic scope of thedownloadable content.
 20. The program product of claim 15, wherein thelimit is expressed within the storage policy as a total amount of unusedstorage space and a quota of the unused storage space permitted to beused by the downloadable content.
 21. The program product of claim 15,wherein the program code for receiving further receives storageinformation from the plurality of ESS cells, and wherein thedownloadable content is replicated to the unused space based on thestorage information.
 22. A system for deploying an application forstoring downloadable content on a plurality of Enterprise Storage System(ESS) cells to which content are assigned based on proximity to ageographic location of the sender, the plurality of ESS cells beingcells that are dedicated to the ESS in a grid having service deliveryagents and download services that allow requested content to beretrieved in chunks from multiple ESS cells, comprising: a computerinfrastructure that includes a computer device, the computerinfrastructure being operable to: receive the downloadable content andcharacteristics corresponding to the downloadable content on a downloadgrid manager; and replicate the downloadable content from the downloadgrid manager to unused storage space of the plurality of ESS cells basedon the characteristics and a storage policy that indicates a limit ofthe unused storage space on each of the plurality of ESS cells that thedownloadable content is permitted occupy, by: determining whether an ESScell to which the content is assigned based on the proximity of the ESScell being greater than a proximity of a different ESS cell to thegeographic location of the sender fails to comply with the storagepolicy; based on a determination that the ESS cell fails to comply,replicating the downloadable content to at least one other ESS cell inthe plurality of ESS cells that is less proximate to the geographiclocation of the sender than the ESS cell; and otherwise, replicating thecontent to the ESS cell to which the content is assigned based on theproximity of the ESS cell to the geographic location of the sender,wherein the download grid manager manages the downloadable content by atleast one of: deleting the downloadable content from one of theplurality of ESS cells or moving the downloadable content to another ESScell, based on the priority, the limit, and the feedback.